TWI508419B - Switch Capacitive Voltage Conversion Device and Method - Google Patents
Switch Capacitive Voltage Conversion Device and Method Download PDFInfo
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- TWI508419B TWI508419B TW102115592A TW102115592A TWI508419B TW I508419 B TWI508419 B TW I508419B TW 102115592 A TW102115592 A TW 102115592A TW 102115592 A TW102115592 A TW 102115592A TW I508419 B TWI508419 B TW I508419B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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Description
本發明是有關於一種電壓轉換裝置及方法，特別是指一種開關電容式電壓轉換裝置及方法。The invention relates to a voltage conversion device and method, in particular to a switched capacitor voltage conversion device and method.
參閱圖1及圖2，習知一種開關電容式電壓轉換裝置包括一第一開關電容式電壓轉換器11、一第二開關電容式電壓轉換器12，及一穩壓電容Cout，每一開關電容式電壓轉換器11、12具有一第一開關M1、一第二開關M2、一第三開關M3、一第四開關M4，及一電容C。Referring to FIG. 1 and FIG. 2, a switched capacitor voltage conversion device includes a first switched capacitor voltage converter 11, a second switched capacitor voltage converter 12, and a Zener capacitor Cout, each of which is switched. The voltage converters 11 and 12 have a first switch M1, a second switch M2, a third switch M3, a fourth switch M4, and a capacitor C.
該第一開關M1具有一接收一輸入電壓Vin的第一端，及一第二端。The first switch M1 has a first end receiving an input voltage Vin and a second end.
該第二開關M2具有一輸出一輸出電壓Vout的第一端，及一電連接該第一開關M1的第二端的第二端。The second switch M2 has a first end that outputs an output voltage Vout, and a second end that is electrically connected to the second end of the first switch M1.
該電容C具有一電連接該第一開關M1的第二端的第一端，及一第二端。The capacitor C has a first end electrically connected to the second end of the first switch M1, and a second end.
該第三開關M3具有一接收一地電壓GND的第一端，及一電連接該電容C的第二端的第二端。The third switch M3 has a first end receiving a ground voltage GND and a second end electrically connected to the second end of the capacitor C.
該第四開關M4具有一電連接該輸入電壓Vin的第一端，及一電連接該電容C的第二端的第二端。The fourth switch M4 has a first end electrically connected to the input voltage Vin and a second end electrically connected to the second end of the capacitor C.
該穩壓電容Cout具有一分別電連接該等第二開關M2的第一端且接收該輸出電壓Vout的第一端，及一接收地電壓GND的第二端。The voltage stabilizing capacitor Cout has a first end electrically connected to the first end of the second switch M2 and receiving the output voltage Vout, and a second end receiving the ground voltage GND.
圖2所示為該等開關之控制時序，其中，該第一開關電容式電壓轉換器11的第一開關M1及該第二開關電容式電壓轉換器12的第二開關M2、第四開關M4受一反相第一訊號PH1B控制而於導通與不導通間切換、該第一開關電容式電壓轉換器11的第二開關M2、第四開關M4及該第二開關電容式電壓轉換器12的第一開關M1受一反相第二訊號PH2B控制而於導通與不導通間切換、該第一開關電容式電壓轉換器11的第三開關M3受一第一訊號PH1控制而於導通與不導通間切換、該第二開關電容式電壓轉換器12的第三開關M3受一第二訊號PH2控制而於導通與不導通間切換。FIG. 2 shows the control timing of the switches, wherein the first switch M1 of the first switched capacitor voltage converter 11 and the second switch M2 and the fourth switch M4 of the second switched capacitor voltage converter 12 The second switch M2, the fourth switch M4, and the second switched capacitor voltage converter 12 of the first switched capacitor voltage converter 11 are controlled by an inverting first signal PH1B to switch between conduction and non-conduction. The first switch M1 is controlled by an inverting second signal PH2B to switch between conduction and non-conduction, and the third switch M3 of the first switched capacitor voltage converter 11 is controlled by a first signal PH1 to be turned on and off. During the switching, the third switch M3 of the second switched capacitor voltage converter 12 is controlled by a second signal PH2 to switch between conducting and non-conducting.
每一開關電容式電壓轉換器11、12會輪流切換於一充電狀態、一浮接狀態及一輸出狀態，在充電狀態下，第一開關M1及第三開關M3導通，第二開關M2及第四開關M4不導通，電容C被充電到跨壓為Vin，在浮接狀態下，第一開關M1、第二開關M2、第三開關M3、第四開關M4皆不導通，在輸出狀態下，第一開關M1及第三開關M3不導通，第二開關M2及第四開關M4導通，電容C供應輸出電壓Vout，輸出電壓Vout為2Vin。Each of the switched capacitor voltage converters 11 and 12 is alternately switched to a charging state, a floating state, and an output state. In the charging state, the first switch M1 and the third switch M3 are turned on, and the second switch M2 and the second switch The four switches M4 are not turned on, and the capacitor C is charged to the voltage across the voltage. In the floating state, the first switch M1, the second switch M2, the third switch M3, and the fourth switch M4 are not turned on. In the output state, The first switch M1 and the third switch M3 are not turned on, the second switch M2 and the fourth switch M4 are turned on, the capacitor C supplies the output voltage Vout, and the output voltage Vout is 2Vin.
習知開關電容式電壓轉換裝置會在四種模式下切換，以下針對每一模式進行說明。Conventional switched-capacitor voltage conversion devices switch between the four modes, which are described below for each mode.
於模式一時，該第一開關電容式電壓轉換器11為充電狀態，此時該第一開關電容式電壓轉換器11的電容C被充電到跨壓為Vin；該第二開關電容式電壓轉換器12為輸出狀態，此時該第二開關電容式電壓轉換器12的電容C供應該輸出電壓Vout，該輸出電壓Vout為2Vin。In mode 1, the first switched capacitor voltage converter 11 is in a charging state, at which time the capacitance C of the first switched capacitor voltage converter 11 is charged to a voltage across Vin; the second switched capacitor voltage converter 12 is an output state. At this time, the capacitor C of the second switched capacitor voltage converter 12 supplies the output voltage Vout, and the output voltage Vout is 2Vin.
於模式二時，該第一開關電容式電壓轉換器11由充電狀態切換到浮接狀態，該第二開關電容式電壓轉換器12則由輸出狀態切換到浮接狀態。In the second mode, the first switched capacitor voltage converter 11 is switched from the charging state to the floating state, and the second switched capacitor voltage converter 12 is switched from the output state to the floating state.
於模式三時，該第一開關電容式電壓轉換器11由浮接狀態轉換為輸出狀態，此時該第一開關電容式電壓轉換器11的電容C供應該輸出電壓Vout，該輸出電壓Vout為2Vin；該第二開關電容式電壓轉換器12由浮接狀態轉換為充電狀態，此時該第二開關電容式電壓轉換器12的電容C被充電到跨壓為Vin。In mode 3, the first switched capacitor voltage converter 11 is switched from a floating state to an output state. At this time, the capacitor C of the first switched capacitor voltage converter 11 supplies the output voltage Vout, and the output voltage Vout is 2Vin; the second switched capacitor voltage converter 12 is switched from a floating state to a charged state, at which time the capacitance C of the second switched capacitor voltage converter 12 is charged to a voltage across Vin.
於模式四時，第一開關電容式電壓轉換器11由輸出狀態切換到浮接狀態，該第二開關電容式電壓轉換器12則由充電狀態切換到浮接狀態。In mode four, the first switched capacitive voltage converter 11 is switched from the output state to the floating state, and the second switched capacitive voltage converter 12 is switched from the charged state to the floating state.
然而習知技術中，於切換模式時，會經過兩次的浮接狀態(模式二及模式四)，於浮接狀態時，該輸出電壓Vout必須藉由該穩壓電容Cout來維持穩定，以避免該輸出電壓Vout因為浮接(floating)而產生電壓飄移的情況。However, in the prior art, when the mode is switched, the floating state (mode 2 and mode 4) is twice. In the floating state, the output voltage Vout must be stabilized by the voltage stabilizing capacitor Cout. It is avoided that the output voltage Vout is caused by floating voltage due to floating.
因此習知技術中每提供一個輸出電壓需要兩個開關電容式電壓轉換器及一個穩壓電容Cout，當需要N(N2)個輸出電壓時，會用到2N個開關電容式電壓轉換器 (包含2N個電容C及N個穩壓電容Cout)，當使用外部電容來實施該等電容時，會導致外接電容數量多，成本較高，若是使用電路內建電容來實施時，由於電容為大面積元件，則會導致電路面積較大，同樣會提高成本。Therefore, in the prior art, one switching capacitor voltage converter and one voltage stabilizing capacitor Cout are required for each output voltage, when N (N is required) 2) When the output voltage is used, 2N switched capacitor voltage converters (including 2N capacitors C and N voltage regulator capacitors Cout) are used. When external capacitors are used to implement these capacitors, the number of external capacitors will be increased. The cost is high. If the built-in capacitor is used for implementation, since the capacitor is a large-area component, the circuit area is large, which also increases the cost.
因此，本發明之第一目的，即在提供一種可減少電路面積及成本的開關電容式電壓轉換裝置。Accordingly, a first object of the present invention is to provide a switched capacitor voltage conversion device that can reduce circuit area and cost.
於是本發明開關電容式電壓轉換裝置，包含：一個第一開關電容式電壓轉換器、一個第二開關電容式電壓轉換器，及一個第三開關電容式電壓轉換器。Thus, the switched capacitor voltage conversion device of the present invention comprises: a first switched capacitor voltage converter, a second switched capacitor voltage converter, and a third switched capacitor voltage converter.
每一開關電容式電壓轉換器包括：一第一開關、一第二開關、一第三開關、一電容、一第四開關、一第五開關，及一第六開關。Each switched capacitor voltage converter includes: a first switch, a second switch, a third switch, a capacitor, a fourth switch, a fifth switch, and a sixth switch.
該第一開關具有一接收一第一輸入電壓的第一端，及一第二端，受控制於導通與不導通間切換。The first switch has a first end that receives a first input voltage, and a second end that is controlled to switch between conducting and non-conducting.
該第二開關具有一接收一第二輸入電壓的第一端，及一電連接該第一開關的第二端的第二端，受控制於導通與不導通間切換。The second switch has a first end receiving a second input voltage, and a second end electrically connected to the second end of the first switch, controlled to switch between conduction and non-conduction.
該第三開關具有一輸出一第一輸出電壓的第一端，及一電連接該第一開關的第二端的第二端，受控制於導通與不導通間切換。The third switch has a first end outputting a first output voltage, and a second end electrically connected to the second end of the first switch, controlled to switch between conduction and non-conduction.
該電容具有一電連接該第三開關的第二端的第一端，及一第二端。The capacitor has a first end electrically connected to the second end of the third switch, and a second end.
該第四開關具有一輸出一第二輸出電壓的第一 端，及一電連接該電容的第二端的第二端，受控制於導通與不導通間切換。The fourth switch has a first output and a second output voltage And a second end electrically connected to the second end of the capacitor is controlled to switch between conduction and non-conduction.
該第五開關具有一接收一第三輸入電壓的第一端，及一電連接該電容的第二端的第二端，受控制於導通與不導通間切換。The fifth switch has a first end receiving a third input voltage, and a second end electrically connected to the second end of the capacitor, controlled to switch between conduction and non-conduction.
該第六開關具有一接收一第四輸入電壓的第一端，及一電連接該電容的第二端的第二端，受控制於導通與不導通間切換。The sixth switch has a first end receiving a fourth input voltage, and a second end electrically connected to the second end of the capacitor, controlled to switch between conduction and non-conduction.
因此，本發明之第二目的，即在提供一種開關電容式電壓轉換方法。Accordingly, a second object of the present invention is to provide a switched capacitor voltage conversion method.
本發明開關電容式電壓轉換方法運用於如上述之開關電容式電壓轉換裝置，每一開關電容式電壓轉換器輪流切換於一充電狀態、一輸出第一電壓狀態，及一輸出第二電壓狀態間。The switched capacitor voltage conversion method of the present invention is applied to the switched capacitor voltage conversion device as described above, wherein each switched capacitor voltage converter is alternately switched between a charging state, an output first voltage state, and an output second voltage state. .
於該充電狀態時，該第一開關、該第五開關導通，其餘開關不導通，該電容受該第一輸入電壓及該第三輸入電壓充電。In the charging state, the first switch and the fifth switch are turned on, and the remaining switches are not turned on, and the capacitor is charged by the first input voltage and the third input voltage.
於該輸出第一電壓狀態時，該第三開關、該第六開關導通，其餘開關不導通，並於該第三開關的第一端輸出該第一輸出電壓。When the first voltage state is output, the third switch and the sixth switch are turned on, and the remaining switches are not turned on, and the first output voltage is outputted at the first end of the third switch.
於該輸出第二電壓狀態時，該第二開關、該第四開關導通，其餘開關不導通，並於該第四開關的第一端輸出該第二輸出電壓。When the second voltage state is output, the second switch and the fourth switch are turned on, and the remaining switches are not turned on, and the second output voltage is outputted at the first end of the fourth switch.
該方法包含下列步驟： 先切換該第一開關電容式電壓轉換器為該輸出第一電壓狀態及該輸出第二電壓狀態中的一第一狀態，接著切換該第三開關電容式電壓轉換器為該輸出第一電壓狀態及該輸出第二電壓狀態中的一第二狀態，接著切換該第二開關電容式電壓轉換器為充電狀態。The method consists of the following steps: Switching the first switched capacitor voltage converter to a first state of the output first voltage state and the output second voltage state, and then switching the third switched capacitor voltage converter to the output first voltage state And outputting a second state in the second voltage state, and then switching the second switched capacitor voltage converter to a charging state.
先切換該第二開關電容式電壓轉換器為該第一狀態，接著切換該第一開關電容式電壓轉換器為該第二狀態，接著切換該第三開關電容式電壓轉換器為充電狀態。First switching the second switched capacitor voltage converter to the first state, then switching the first switched capacitor voltage converter to the second state, and then switching the third switched capacitor voltage converter to a charged state.
先切換該第三開關電容式電壓轉換器為該第一狀態，接著切換該第二開關電容式電壓轉換器為該第二狀態，接著切換該第一開關電容式電壓轉換器為充電狀態。First switching the third switched capacitor voltage converter to the first state, then switching the second switched capacitor voltage converter to the second state, and then switching the first switched capacitor voltage converter to a charged state.
因此，本發明之第三目的，即在提供一種開關電容式電壓轉換方法。Accordingly, a third object of the present invention is to provide a switched capacitor voltage conversion method.
本發明開關電容式電壓轉換方法運用於一開關電容式電壓轉換裝置，該開關電容式電壓轉換裝置包括三開關電容式電壓轉換器，每一開關電容式電壓轉換器切換於一充電狀態、一輸出第一電壓狀態及一輸出第二電壓狀態間，該開關電容式電壓轉換方法包含以下步驟：先切換該第一開關電容式電壓轉換器為該輸出第一電壓狀態，接著切換該第三開關電容式電壓轉換器為該輸出第二電壓狀態，接著切換該第二開關電容式電壓轉換器為充電狀態。The switched capacitor voltage conversion method of the invention is applied to a switched capacitor voltage conversion device, wherein the switched capacitor voltage conversion device comprises a three-switch capacitor voltage converter, and each switched capacitor voltage converter is switched to a charging state and an output. The switched capacitor voltage conversion method includes the steps of: first switching the first switched capacitor voltage converter to the output first voltage state, and then switching the third switching capacitor between the first voltage state and the output second voltage state The voltage converter outputs the second voltage state, and then switches the second switched capacitor voltage converter to a state of charge.
先切換該第二開關電容式電壓轉換器為該輸出第一電壓狀態，接著切換該第一開關電容式電壓轉換器為 該輸出第二電壓狀態，接著切換該第三開關電容式電壓轉換器為充電狀態。Switching the second switched capacitor voltage converter to the output first voltage state, and then switching the first switched capacitor voltage converter to The outputting the second voltage state, and then switching the third switched capacitor voltage converter to a state of charge.
先切換該第三開關電容式電壓轉換器為該輸出第一電壓狀態，接著切換該第二開關電容式電壓轉換器為該輸出第二電壓狀態，接著切換該第一開關電容式電壓轉換器為充電狀態。Switching the third switched capacitor voltage converter to the output first voltage state, then switching the second switched capacitor voltage converter to the output second voltage state, and then switching the first switched capacitor voltage converter to charging.
2‧‧‧第一開關電容式電壓轉換器2‧‧‧First switched capacitor voltage converter
3‧‧‧第二開關電容式電壓轉換器3‧‧‧Second switched capacitor voltage converter
4‧‧‧第三開關電容式電壓轉換器4‧‧‧The third switched capacitor voltage converter
M1‧‧‧第一開關M1‧‧‧ first switch
M2‧‧‧第二開關M2‧‧‧ second switch
M3‧‧‧第三開關M3‧‧‧ third switch
M4‧‧‧第四開關M4‧‧‧fourth switch
M5‧‧‧第五開關M5‧‧‧ fifth switch
M6‧‧‧第六開關M6‧‧‧ sixth switch
C‧‧‧電容C‧‧‧ capacitor
PH1‧‧‧第一訊號PH1‧‧‧ first signal
PH2‧‧‧第二訊號PH2‧‧‧second signal
PH3‧‧‧第三訊號PH3‧‧‧third signal
PH4‧‧‧第四訊號PH4‧‧‧fourth signal
PH5‧‧‧第五訊號PH5‧‧‧ fifth signal
PH6‧‧‧第六訊號PH6‧‧‧6th signal
PH7‧‧‧第七訊號PH7‧‧‧ seventh signal
PH8‧‧‧第八訊號PH8‧‧‧8th signal
PH9‧‧‧第九訊號PH9‧‧‧ ninth signal
Vin1‧‧‧第一輸入電壓Vin1‧‧‧ first input voltage
Vin2‧‧‧第二輸入電壓Vin2‧‧‧ second input voltage
Vin3‧‧‧第三輸入電壓Vin3‧‧‧ third input voltage
Vin4‧‧‧第四輸入電壓Vin4‧‧‧ fourth input voltage
Vout1‧‧‧第一輸出電壓Vout1‧‧‧ first output voltage
Vout2‧‧‧第二輸出電壓Vout2‧‧‧second output voltage
本發明之其他的特徵及功效，將於參照圖式的實施方式中清楚地呈現，其中：圖1是習知一種開關電容式電壓轉換裝置的電路示意圖；圖2是該習知開關電容式電壓轉換裝置的時序圖；圖3是本發明開關電容式電壓轉換裝置之一較佳實施例的電路示意圖；圖4是該較佳實施例於第一種操作方式下的時序圖；圖5是該較佳實施例於第一種操作方式下模式一的操作示意圖；圖6是該較佳實施例於第一種操作方式下模式三的操作示意圖；圖7是該較佳實施例於第一種操作方式下模式五的操作示意圖；圖8是該較佳實施例於第二種操作方式下的時序圖；圖9是該較佳實施例於第二種操作方式下模式一的操作示意圖； 圖10是該較佳實施例於第二種操作方式下模式三的操作示意圖；圖11是該較佳實施例於第二種操作方式下模式五的操作示意圖；圖12是本發明開關電容式電壓轉換方法之較佳實施例的流程圖。Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a circuit diagram of a conventional switched capacitor voltage conversion device; FIG. 2 is a conventional switched capacitor voltage. FIG. 3 is a circuit diagram of a preferred embodiment of the switched capacitor voltage conversion device of the present invention; FIG. 4 is a timing diagram of the preferred embodiment in the first mode of operation; FIG. FIG. 6 is a schematic diagram of operation of mode 3 in the first mode of operation in the first mode of operation; FIG. 7 is a schematic view of the first embodiment of the preferred embodiment in FIG. FIG. 8 is a timing diagram of the preferred embodiment in the second mode of operation; FIG. 9 is a schematic diagram of the operation of mode 1 in the second mode of operation of the preferred embodiment; 10 is a schematic diagram of operation of mode 3 in the second mode of operation of the preferred embodiment; FIG. 11 is a schematic diagram of operation of mode 5 in the second mode of operation of the preferred embodiment; and FIG. 12 is a switched capacitor type of the present invention. A flow chart of a preferred embodiment of a voltage conversion method.
在本發明被詳細描述之前，應當注意在以下的說明內容中，類似的元件是以相同的編號來表示。Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.
參閱圖3與圖4，本發明開關電容式電壓轉換裝置之較佳實施例適用於提供兩個輸出電壓Vout1、Vout2，該開關電容式電壓轉換裝置包含：一個第一開關電容式電壓轉換器2、一個第二開關電容式電壓轉換器3，及一個第三開關電容式電壓轉換器4。Referring to FIG. 3 and FIG. 4, the preferred embodiment of the switched capacitor voltage conversion device of the present invention is adapted to provide two output voltages Vout1, Vout2, the switched capacitor voltage conversion device comprising: a first switched capacitor voltage converter 2 A second switched capacitor voltage converter 3 and a third switched capacitor voltage converter 4.
每一開關電容式電壓轉換器2、3、4包括：一第一開關M1、一第二開關M2、一第三開關M3、一電容C、一第四開關M4、一第五開關M5、及一第六開關M6。Each of the switched capacitor voltage converters 2, 3, 4 includes: a first switch M1, a second switch M2, a third switch M3, a capacitor C, a fourth switch M4, a fifth switch M5, and A sixth switch M6.
該第一開關M1具有一接收一第一輸入電壓Vin1的第一端，及一第二端，受控制於導通與不導通間切換。The first switch M1 has a first end that receives a first input voltage Vin1, and a second end that is controlled to switch between conduction and non-conduction.
該第二開關M2具有一接收一第二輸入電壓Vin2的第一端，及一電連接該第一開關M1的第二端的第二端，受控制於導通與不導通間切換。The second switch M2 has a first end that receives a second input voltage Vin2, and a second end that is electrically connected to the second end of the first switch M1, and is controlled to switch between conduction and non-conduction.
該第三開關M3具有一輸出一第一輸出電壓 Vout1的第一端，及一電連接該第一開關M1的第二端的第二端，受控制於導通與不導通間切換。The third switch M3 has an output and a first output voltage The first end of Vout1 and the second end electrically connected to the second end of the first switch M1 are controlled to switch between conduction and non-conduction.
該電容C具有一電連接該第三開關M3的第二端的第一端，及一第二端。The capacitor C has a first end electrically connected to the second end of the third switch M3, and a second end.
該第四開關M4具有一輸出一第二輸出電壓Vout2的第一端，及一電連接該電容C的第二端的第二端，受控制於導通與不導通間切換。The fourth switch M4 has a first end outputting a second output voltage Vout2, and a second end electrically connected to the second end of the capacitor C, controlled to switch between conduction and non-conduction.
該第五開關M5具有一接收一第三輸入電壓Vin3的第一端，及一電連接該電容C的第二端的第二端，受控制於導通與不導通間切換。The fifth switch M5 has a first end receiving a third input voltage Vin3 and a second end electrically connected to the second end of the capacitor C, and is controlled to switch between conduction and non-conduction.
該第六開關M6具有一接收一第四輸入電壓Vin4的第一端，及一電連接該電容C的第二端的第二端，受控制於導通與不導通間切換。The sixth switch M6 has a first end receiving a fourth input voltage Vin4 and a second end electrically connected to the second end of the capacitor C, and is controlled to switch between conduction and non-conduction.
本實施例有兩種操作方式，詳細說明如下。There are two modes of operation in this embodiment, which are described in detail below.
圖4所示為第一種操作方式下該等開關電容式電壓轉換器2、3、4之開關控制時序，其中，該第一開關電容式電壓轉換器2、該第二開關電容式電壓轉換器3、該第三開關電容式電壓轉換器4的第一開關M1及第五開關M5分別受一第一訊號PH1、一第五訊號PH5、一第九訊號PH9控制而於導通與不導通間切換；該第一開關電容式電壓轉換器2、該第二開關電容式電壓轉換器3、該第三開關電容式電壓轉換器4的第二開關M2及第四開關M4分別受一第二訊號PH2、一第六訊號PH6、一第七訊號PH7控制而於導通與不導通間切換；該第一開關電容式電壓轉換器2 、該第二開關電容式電壓轉換器3、該第三開關電容式電壓轉換器4的第三開關M3及第六開關M6分別受一第三訊號PH3、一第四訊號PH4、一第八訊號PH8控制而於導通與不導通間切換。Figure 4 shows the switching control timing of the switched capacitor voltage converters 2, 3, 4 in the first mode of operation, wherein the first switched capacitor voltage converter 2, the second switched capacitor voltage converter The first switch M1 and the fifth switch M5 of the third switched capacitor voltage converter 4 are controlled by a first signal PH1, a fifth signal PH5, and a ninth signal PH9, respectively, between the conduction and the non-conduction. Switching; the first switched capacitor voltage converter 2, the second switched capacitor voltage converter 3, the second switch M2 and the fourth switch M4 of the third switched capacitor voltage converter 4 are respectively subjected to a second signal PH2, a sixth signal PH6, a seventh signal PH7 control and switch between conduction and non-conduction; the first switched capacitor voltage converter 2 The second switched capacitor voltage converter 3 and the third switch M3 and the sixth switch M6 of the third switched capacitor voltage converter 4 are respectively subjected to a third signal PH3, a fourth signal PH4, and an eighth signal. PH8 control switches between conduction and non-conduction.
於第一種操作方式下，本實施例會在六種模式(即模式一至模式六)下切換，且每一開關電容式電壓轉換器2、3、4依序切換於一充電狀態、一輸出第二電壓狀態、一輸出第一電壓狀態。In the first mode of operation, the embodiment switches in six modes (ie, mode one to mode six), and each of the switched capacitor voltage converters 2, 3, and 4 is sequentially switched to a charging state and an output state. Two voltage states, one output first voltage state.
在充電狀態下，該第一開關M1、該第五開關M5導通，其餘開關不導通，該電容C受該第一輸入電壓Vin1及該第三輸入電壓Vin3充電至跨壓為(Vin1-Vin3)；在輸出第一電壓狀態下，該第三開關M3、該第六開關M6導通，其餘開關不導通，並於該第三開關M3的第一端輸出該第一輸出電壓Vout1，該電容C供應該第一輸出電壓Vout1=Vin1-Vin3+Vin4；在輸出第二電壓狀態下，該第二開關M2、該第四開關M4導通，其餘開關不導通，並於該第四開關M4的第一端輸出該第二輸出電壓Vout2，該電容C供應該第二輸出電壓Vout2=Vin2-(Vin1-Vin3)。In the charging state, the first switch M1 and the fifth switch M5 are turned on, and the remaining switches are not turned on, and the capacitor C is charged to the voltage across the first input voltage Vin1 and the third input voltage Vin3 (Vin1-Vin3). When the first voltage state is output, the third switch M3 and the sixth switch M6 are turned on, and the remaining switches are not turned on, and the first output voltage Vout1 is outputted at the first end of the third switch M3, and the capacitor C is used for The first output voltage Vout1=Vin1-Vin3+Vin4; in the output second voltage state, the second switch M2 and the fourth switch M4 are turned on, and the remaining switches are not turned on, and at the first end of the fourth switch M4 The second output voltage Vout2 is output, and the capacitor C supplies the second output voltage Vout2=Vin2-(Vin1-Vin3).
在本實施例中，可以是Vin1=Vin4=VCI，Vin2=Vin3=0，使得Vout1=2VCI，Vout2=-VCI，也可以是Vin1=Vin4=VH，Vin2=Vin3=VL，使得Vout1=2VH-VL，Vout2=2VL-VH，且本實施例不以此為限。In this embodiment, it may be Vin1=Vin4=VCI, Vin2=Vin3=0, such that Vout1=2VCI, Vout2=-VCI, or Vin1=Vin4=VH, Vin2=Vin3=VL, such that Vout1=2VH- VL, Vout2=2VL-VH, and the embodiment is not limited thereto.
以下針對第一種操作方式下的每一模式進行說明。The following describes each mode in the first mode of operation.
參閱圖4與圖5，此時該第一開關電容式電壓轉換器2為充電狀態，電容C受該第一輸入電壓Vin1及該第三輸入電壓Vin3充電至跨壓為(Vin1-Vin3)；該第二開關電容式電壓轉換器3為輸出第一電壓狀態，此時該第二開關電容式電壓轉換器3的電容C供應該第一輸出電壓Vout1，該第一輸出電壓Vout1=Vin1-Vin3+Vin4；該第三開關電容式電壓轉換器4為輸出第二電壓狀態，此時該第三開關電容式電壓轉換器4的電容C供應該第二輸出電壓Vout2，該第二輸出電壓Vout2=Vin2-(Vin1-Vin3)。Referring to FIG. 4 and FIG. 5, the first switched capacitor voltage converter 2 is in a charging state, and the capacitor C is charged to the voltage across the first input voltage Vin1 and the third input voltage Vin3 (Vin1-Vin3); The second switched capacitor voltage converter 3 outputs a first voltage state. At this time, the capacitor C of the second switched capacitor voltage converter 3 supplies the first output voltage Vout1. The first output voltage Vout1=Vin1-Vin3 +Vin4; the third switched capacitor voltage converter 4 outputs a second voltage state, at which time the capacitor C of the third switched capacitor voltage converter 4 supplies the second output voltage Vout2, the second output voltage Vout2= Vin2-(Vin1-Vin3).
該等開關電容式電壓轉換器2、3、4的動作依序為：該第一開關電容式電壓轉換器2由充電狀態切換至輸出第二電壓狀態、該第三開關電容式電壓轉換器4由輸出第二電壓狀態切換至輸出第一電壓狀態、該第二開關電容式電壓轉換器3由輸出第一電壓狀態切換至充電狀態。The operations of the switched capacitor voltage converters 2, 3, and 4 are sequentially: the first switched capacitor voltage converter 2 is switched from the charging state to the output second voltage state, and the third switched capacitor voltage converter 4 Switching from the output second voltage state to outputting the first voltage state, the second switched capacitor voltage converter 3 is switched from the output first voltage state to the charged state.
由於該第一開關電容式電壓轉換器2與該第三開關電容式電壓轉換器4的輸出第二電壓狀態時間重疊，且該第三開關電容式電壓轉換器4與該第二開關電容式電壓轉換器3的輸出第一電壓狀態時間重疊，故該第一輸出電壓Vout1與該第二輸出電壓Vout2於任何時間都有一個以上的電容C提供電壓，所以能確保該第一輸出電壓Vout1與該第二輸出電壓Vout2不會有浮接而導致電壓值飄移的情況出現。Because the first switched capacitor voltage converter 2 overlaps with the output second voltage state of the third switched capacitor voltage converter 4, and the third switched capacitor voltage converter 4 and the second switched capacitor voltage The output voltage state of the converter 3 overlaps with each other, so that the first output voltage Vout1 and the second output voltage Vout2 have more than one capacitor C to supply voltage at any time, so that the first output voltage Vout1 and the The second output voltage Vout2 does not float and causes a voltage value to drift.
參閱圖4與圖6，該第二開關電容式電壓轉換器3為充電狀態時，電容C受該第一輸入電壓Vin1及該第三輸入電壓Vin3充電至跨壓為(Vin1-Vin3)；該第三開關電容式電壓轉換器4為輸出第一電壓狀態，此時該第三開關電容式電壓轉換器4的電容C供應該第一輸出電壓Vout1，該第一輸出電壓Vout1=Vin1-Vin3+Vin4；該第一開關電容式電壓轉換器2為輸出第二電壓狀態，此時該第一開關電容式電壓轉換器2的電容C供應該第二輸出電壓Vout2，該第二輸出電壓Vout2=Vin2-(Vin1-Vin3)。Referring to FIG. 4 and FIG. 6, when the second switched capacitor voltage converter 3 is in a charging state, the capacitor C is charged to the voltage across the first input voltage Vin1 and the third input voltage Vin3 (Vin1-Vin3); The third switched capacitor voltage converter 4 outputs a first voltage state. At this time, the capacitor C of the third switched capacitor voltage converter 4 supplies the first output voltage Vout1, and the first output voltage Vout1=Vin1-Vin3+ The first switched capacitor voltage converter 2 outputs a second voltage state. At this time, the capacitor C of the first switched capacitor voltage converter 2 supplies the second output voltage Vout2, and the second output voltage Vout2=Vin2 - (Vin1-Vin3).
該等開關電容式電壓轉換器2、3、4的動作依序為：該第二開關電容式電壓轉換器3由充電狀態切換至輸出第二電壓狀態、該第一開關電容式電壓轉換器2由輸出第二電壓狀態切換至輸出第一電壓狀態、該第三開關電容式電壓轉換器4由輸出第一電壓狀態切換至充電狀態。The operations of the switched capacitor voltage converters 2, 3, and 4 are sequentially: the second switched capacitor voltage converter 3 is switched from the charging state to the output second voltage state, and the first switched capacitor voltage converter 2 The output of the second voltage state is switched to the output first voltage state, and the third switched capacitor voltage converter 4 is switched from the output first voltage state to the charged state.
由於該第二開關電容式電壓轉換器3與該第一開關電容式電壓轉換器2的輸出第二電壓狀態時間重疊，且該第一開關電容式電壓轉換器2與該第三開關電容式電壓轉換器4的輸出第一電壓狀態時間重疊，故該第一輸出電壓Vout1與該第二輸出電壓Vout2於任何時間都有一個以上的電容C提供電壓，所以能確保該第一輸出電壓Vout1與該第二輸出電壓Vout2不會有浮接而導致電壓值飄移的情況出現。Because the second switched capacitor voltage converter 3 overlaps with the output second voltage state of the first switched capacitor voltage converter 2, and the first switched capacitor voltage converter 2 and the third switched capacitor voltage The output voltage state of the converter 4 overlaps with time, so that the first output voltage Vout1 and the second output voltage Vout2 have more than one capacitor C to supply voltage at any time, so that the first output voltage Vout1 and the The second output voltage Vout2 does not float and causes a voltage value to drift.
參閱圖4與圖7，該第三開關電容式電壓轉換器4為充電狀態時，電容C受該第一輸入電壓Vin1及該第三輸入電壓Vin3充電至跨壓為(Vin1-Vin3)；該第一開關電容式電壓轉換器2為輸出第一電壓狀態，此時該第一開關電容式電壓轉換器2的電容C供應該第一輸出電壓Vout1，該第一輸出電壓Vout1=Vin1-Vin3+Vin4；該第二開關電容式電壓轉換器3為輸出第二電壓狀態，此時該第二開關電容式電壓轉換器3的電容C供應該第二輸出電壓Vout2，該第二輸出電壓Vout2=Vin2-(Vin1-Vin3)。Referring to FIG. 4 and FIG. 7 , when the third switched capacitor voltage converter 4 is in a charging state, the capacitor C is charged to the voltage across the first input voltage Vin1 and the third input voltage Vin3 (Vin1-Vin3); The first switched capacitor voltage converter 2 outputs a first voltage state. At this time, the capacitor C of the first switched capacitor voltage converter 2 supplies the first output voltage Vout1, and the first output voltage Vout1=Vin1-Vin3+ The second switched capacitor voltage converter 3 outputs a second voltage state. At this time, the capacitor C of the second switched capacitor voltage converter 3 supplies the second output voltage Vout2, and the second output voltage Vout2=Vin2 - (Vin1-Vin3).
該等開關電容式電壓轉換器2、3、4的動作依序為：該第三開關電容式電壓轉換器4由充電狀態切換至輸出第二電壓狀態、該第二開關電容式電壓轉換器3由輸出第二電壓狀態切換至輸出第一電壓狀態、該第一開關電容式電壓轉換器2由輸出第一電壓狀態切換至充電狀態。The operations of the switched capacitor voltage converters 2, 3, and 4 are sequentially: the third switched capacitor voltage converter 4 is switched from the charging state to the output second voltage state, and the second switched capacitor voltage converter 3 The first switched-capacitor voltage converter 2 is switched from the output first voltage state to the charged state by switching from the output second voltage state to the output first voltage state.
由於該第三開關電容式電壓轉換器4與該第二開關電容式電壓轉換器3的輸出第二電壓狀態時間重疊，且該第二開關電容式電壓轉換器3與該第一開關電容式電壓轉換器2的輸出第一電壓狀態時間重疊，故該第一輸出電壓Vout1與該第二輸出電壓Vout2於任何時間都有一個以上的電容C提供電壓，所以能確保該第一輸出電壓Vout1與該第二輸出電壓Vout2不會有浮接而導致電壓值飄移的情況出現。Because the third switched capacitor voltage converter 4 overlaps with the output second voltage state of the second switched capacitor voltage converter 3, and the second switched capacitor voltage converter 3 and the first switched capacitor voltage The first voltage state of the output of the converter 2 overlaps, so that the first output voltage Vout1 and the second output voltage Vout2 have more than one capacitor C at any time, so that the first output voltage Vout1 and the The second output voltage Vout2 does not float and causes a voltage value to drift.
圖8所示為第二種操作方式下該等開關電容式電壓轉換器2、3、4之開關控制時序，相似於圖4所示的第一種操作方式下該等開關電容式電壓轉換器2、3、4之開關控制時序，不同之處在於：該第一開關電容式電壓轉換器2、該第二開關電容式電壓轉換器3、該第三開關電容式電壓轉換器4的第三開關M3及第六開關M6分別受第二訊號PH2、第六訊號PH6、第七訊號PH7控制而於導通與不導通間切換；該第一開關電容式電壓轉換器2、該第二開關電容式電壓轉換器3、該第三開關電容式電壓轉換器4的第二開關M2及第四開關M4分別受第三訊號PH3、第四訊號PH4、第八訊號PH8控制而於導通與不導通間切換；及每一開關電容式電壓轉換器2、3、4依序切換於充電狀態、輸出第一電壓狀態、輸出第二電壓狀態。Figure 8 shows the switching control timing of the switched capacitor voltage converters 2, 3, 4 in the second mode of operation, similar to the switched capacitor voltage converter in the first mode of operation shown in Figure 4. 2, 3, 4 switching control timing, the difference is: the first switched capacitive voltage converter 2, the second switched capacitive voltage converter 3, the third of the third switched capacitive voltage converter 4 The switch M3 and the sixth switch M6 are respectively controlled by the second signal PH2, the sixth signal PH6, and the seventh signal PH7 to switch between conduction and non-conduction; the first switched capacitor voltage converter 2, the second switched capacitor type The voltage converter 3, the second switch M2 and the fourth switch M4 of the third switched capacitor voltage converter 4 are controlled by the third signal PH3, the fourth signal PH4, and the eighth signal PH8, respectively, to switch between conduction and non-conduction. And each of the switched capacitor voltage converters 2, 3, 4 sequentially switches to a state of charge, outputs a first voltage state, and outputs a second voltage state.
以下針對第二種操作方式下的每一模式進行說明。The following describes each mode in the second mode of operation.
參閱圖8與圖9，於模式一時，該第一開關電容式電壓轉換器2為充電狀態，該第二開關電容式電壓轉換器3為輸出第二電壓狀態，該第三開關電容式電壓轉換器4為輸出第一電壓狀態。Referring to FIG. 8 and FIG. 9, in the first mode, the first switched capacitor voltage converter 2 is in a charging state, and the second switched capacitor voltage converter 3 is in an output second voltage state, the third switched capacitor voltage conversion The device 4 outputs a first voltage state.
於模式二時，該等開關電容式電壓轉換器2、3、4的動作依序為：該第一開關電容式電壓轉換器2由充電狀態切換至輸出第一電壓狀態、該第三開關電容式電壓轉換器4由輸出第一電壓狀態切換至輸出第二電壓狀態、該第二開關電容式電壓轉換器3由輸出第二電壓狀態切換至 充電狀態。In mode 2, the operations of the switched capacitor voltage converters 2, 3, and 4 are sequentially: the first switched capacitor voltage converter 2 is switched from a charging state to an output first voltage state, and the third switched capacitor The voltage converter 4 is switched from the output first voltage state to the output second voltage state, and the second switched capacitor voltage converter 3 is switched from the output second voltage state to charging.
參閱圖8與圖10，於模式三時，該第二開關電容式電壓轉換器3為充電狀態，該第三開關電容式電壓轉換器4為輸出第二電壓狀態，該第一開關電容式電壓轉換器2為輸出第一電壓狀態。Referring to FIG. 8 and FIG. 10, in mode 3, the second switched capacitor voltage converter 3 is in a charging state, and the third switched capacitor voltage converter 4 is configured to output a second voltage state, the first switched capacitor voltage. Converter 2 is in outputting a first voltage state.
於模式四時，該等開關電容式電壓轉換器2、3、4的動作依序為：該第二開關電容式電壓轉換器3由充電狀態切換至輸出第一電壓狀態、該第一開關電容式電壓轉換器2由輸出第一電壓狀態切換至輸出第二電壓狀態、該第三開關電容式電壓轉換器4由輸出第二電壓狀態切換至充電狀態。In the fourth mode, the operations of the switched capacitor voltage converters 2, 3, and 4 are sequentially: the second switched capacitor voltage converter 3 is switched from the charging state to the output first voltage state, and the first switching capacitor The voltage converter 2 is switched from the output first voltage state to the output second voltage state, and the third switched capacitor voltage converter 4 is switched from the output second voltage state to the charged state.
參閱圖8與圖11，於模式五時，該第三開關電容式電壓轉換器4為充電狀態，該第一開關電容式電壓轉換器2為輸出第二電壓狀態，該第二開關電容式電壓轉換器3為輸出第一電壓狀態。Referring to FIG. 8 and FIG. 11 , in mode 5, the third switched capacitor voltage converter 4 is in a charging state, and the first switched capacitor voltage converter 2 is outputting a second voltage state, and the second switched capacitor voltage is Converter 3 is in outputting a first voltage state.
於模式六時，該等開關電容式電壓轉換器2、3、4的動作依序為：該第三開關電容式電壓轉換器4由充電狀態切換至輸出第一電壓狀態、該第二開關電容式電壓轉換器3由輸出第一電壓狀態切換至輸出第二電壓狀態、該第一開關電容式電壓轉換器2由輸出第二電壓狀態切換至充電狀態。In mode 6, the operations of the switched capacitor voltage converters 2, 3, and 4 are sequentially: the third switched capacitor voltage converter 4 is switched from a state of charge to an output first voltage state, and the second switched capacitor The voltage converter 3 is switched from the output first voltage state to the output second voltage state, and the first switched capacitor voltage converter 2 is switched from the output second voltage state to the charged state.
經由以上的說明，可將本實施例的優點歸納如下：本實施例中藉由將該等開關電容式電壓轉換器 2、3、4於輸出第一電壓狀態的時間部分重疊、於輸出第二電壓狀態的時間部分重疊，可使該第一輸出電壓Vout1與該第二輸出電壓Vout2於任何時間都有一個以上的電容C提供電壓，故能確保該第一輸出電壓Vout1與該第二輸出電壓Vout2不會有浮接而導致電壓值飄移的情況出現，因此可以省去習知技術中所使用的穩壓電容，所以提供兩個輸出電壓只需要三個開關電容式電壓轉換器，相較於習知技術提供兩個輸出電壓即需要四個開關電容式電壓轉換器，可減少外接電容數量或電路面積，進而減少成本(習知要用到16個開關、6個電容C，本實施例要用到18個開關、3個電容C，比習知少用3個電容C，但多用2個開關，如果都以一個積體電路實現，通常3個電容C的面積會遠大於2個開關的面積，所以本實施例的電路面積確實會比較小)。Through the above description, the advantages of the embodiment can be summarized as follows: in the embodiment, the switched capacitor voltage converter is 2, 3, 4 partially overlap at a time when the first voltage state is output, and partially overlap at a time when the second voltage state is output, so that the first output voltage Vout1 and the second output voltage Vout2 can have more than one at any time. The capacitor C provides a voltage, so that the first output voltage Vout1 and the second output voltage Vout2 are not floating and the voltage value drifts, so that the voltage stabilizing capacitor used in the prior art can be omitted. Therefore, only two switched capacitor voltage converters are required to provide two output voltages. Compared with the prior art, two output voltages are required, that is, four switched capacitor voltage converters are required, which can reduce the number of external capacitors or circuit area, thereby reducing Cost (used to use 16 switches, 6 capacitors C, this embodiment will use 18 switches, 3 capacitors C, less than 3 capacitors C, but more than 2 switches, if you use An integrated circuit implementation, usually the area of the three capacitors C will be much larger than the area of the two switches, so the circuit area of this embodiment will indeed be relatively small).
值得注意的是，上述開關電容式電壓轉換裝置可以擴充為提供N(N2)個輸出電壓(即第一輸出電壓Vout1至第N輸出電壓)，此時，開關電容式電壓轉換裝置包含N+1個開關電容式電壓轉換器(即第一開關電容式電壓轉換器至第N+1開關電容式電壓轉換器)。It is worth noting that the above switched-capacitor voltage conversion device can be expanded to provide N (N) 2) an output voltage (ie, a first output voltage Vout1 to an Nth output voltage). At this time, the switched capacitor voltage conversion device includes N+1 switched capacitor voltage converters (ie, the first switched capacitor voltage converter to The N+1 switched capacitor voltage converter).
由於本領域中具有通常知識者根據以上說明可以推知擴充細節，因此不多加說明。Since the general knowledge in the art can infer the details of the expansion based on the above description, it will not be explained.
參閱圖3及圖12，本發明開關電容式電壓轉換方法之較佳實施例運用於上述之開關電容式電壓轉換裝置，該方法包含下列步驟： 步驟81：先切換該第一開關電容式電壓轉換器2為該輸出第一電壓狀態及該輸出第二電壓狀態中的一第一狀態，接著切換該第三開關電容式電壓轉換器4為該輸出第一電壓狀態及該輸出第二電壓狀態中的一第二狀態，接著切換該第二開關電容式電壓轉換器3為充電狀態。Referring to FIG. 3 and FIG. 12, a preferred embodiment of the switched capacitor voltage conversion method of the present invention is applied to the above switched capacitor voltage conversion device, and the method comprises the following steps: Step 81: first switch the first switched capacitor voltage converter 2 to a first state of the output first voltage state and the output second voltage state, and then switch the third switched capacitor voltage converter 4 to And outputting a second state of the first voltage state and the output second voltage state, and then switching the second switched capacitor voltage converter 3 to a charging state.
步驟82：先切換該第二開關電容式電壓轉換器3為該第一狀態，接著切換該第一開關電容式電壓轉換器2為該第二狀態，接著切換該第三開關電容式電壓轉換器4為充電狀態。Step 82: first switch the second switched capacitor voltage converter 3 to the first state, then switch the first switched capacitor voltage converter 2 to the second state, and then switch the third switched capacitor voltage converter. 4 is the state of charge.
步驟83：先切換該第三開關電容式電壓轉換器4為該第一狀態，接著切換該第二開關電容式電壓轉換器3為該第二狀態，接著切換該第一開關電容式電壓轉換器2為充電狀態。Step 83: first switch the third switched capacitor voltage converter 4 to the first state, then switch the second switched capacitor voltage converter 3 to the second state, and then switch the first switched capacitor voltage converter. 2 is the state of charge.
當該第一狀態是該輸出第二電壓狀態、該第二狀態是該輸出第一電壓狀態時，開關電容式電壓轉換裝置運作於第一種操作方式，當該第一狀態是該輸出第一電壓狀態、該第二狀態是該輸出第二電壓狀態時，開關電容式電壓轉換裝置運作於第二種操作方式。When the first state is the output second voltage state, and the second state is the output first voltage state, the switched capacitor voltage conversion device operates in a first mode of operation, when the first state is the output first When the voltage state and the second state are the output second voltage state, the switched capacitor voltage conversion device operates in the second mode of operation.
值得注意的是，上述開關電容式電壓轉換方法可以擴充為應用於使用N+1(N2)個開關電容式電壓轉換器提供N個輸出電壓的情況。It is worth noting that the above switched capacitor voltage conversion method can be extended to use N+1 (N 2) A switched-capacitor voltage converter provides N output voltages.
由於本領域中具有通常知識者根據以上說明可以推知擴充細節，因此不多加說明。Since the general knowledge in the art can infer the details of the expansion based on the above description, it will not be explained.
綜上所述，上述實施例不僅可於提供多個輸出 電壓時降低電路面積以節省成本，亦可確保輸出電壓不會有浮接而導致電壓值飄移的情況出現，故確實能達成本發明之目的。In summary, the above embodiment can provide not only multiple outputs When the voltage is reduced, the circuit area is reduced to save cost, and it is also ensured that the output voltage does not float and the voltage value drifts, so that the object of the present invention can be achieved.
惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及專利說明書內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.
2‧‧‧第一開關電容式電壓轉換器2‧‧‧First switched capacitor voltage converter
3‧‧‧第二開關電容式電壓轉換器3‧‧‧Second switched capacitor voltage converter
4‧‧‧第三開關電容式電壓轉換器4‧‧‧The third switched capacitor voltage converter
M1‧‧‧第一開關M1‧‧‧ first switch
M2‧‧‧第二開關M2‧‧‧ second switch
M3‧‧‧第三開關M3‧‧‧ third switch
M4‧‧‧第四開關M4‧‧‧fourth switch
M5‧‧‧第五開關M5‧‧‧ fifth switch
M6‧‧‧第六開關M6‧‧‧ sixth switch
C‧‧‧電容C‧‧‧ capacitor
Vin1‧‧‧第一輸入電壓Vin1‧‧‧ first input voltage
Vin2‧‧‧第二輸入電壓Vin2‧‧‧ second input voltage
Vin3‧‧‧第三輸入電壓Vin3‧‧‧ third input voltage
Vin4‧‧‧第四輸入電壓Vin4‧‧‧ fourth input voltage
Vout1‧‧‧第一輸出電壓Vout1‧‧‧ first output voltage
Vout2‧‧‧第二輸出電壓Vout2‧‧‧second output voltage
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